Hi, I have data from ATUS respondents only, all years, and am trying to understand the NIU (not in universe) coding.
Shouldn’t there be NIU observations for time use variables re: children for those with no children in the household, instead of 0 values for those who don’t have household kids? For example, “bls_carehh_kid” has no NIUs, and the number of observations with value ‘0’ is bigger than the no. of observations with hh_child=0. How can I be sure that the time spent with children variables actually exclude the respondents with no children?
What kind of respondent is NIU in “schlcoll”? There are 87k such observations. How are these different from those who are not enrolled in school or college?
thanks much, Sanjiv